Stop with the "white knight" accusations. So absurd, that is not what was happening.
To answer your question - if you play on PC, you should install ME3Tweaks Mod Manager, and then you have access to the in-game console. If you are the host, you can killviewedactor, you can instant kick, you can do whatever. This also allows in-game text chat.
Be aware, this is also an avenue to easy cheating. Because no one cared 10 years ago, and still no one cares now. If I am in a match with a cheater, and it is affecting me, I quit the match and look for another.
Stop shrieking into an abyss about an ancient game that is not competitive, it is silly at best. If you need credits for your manifest, I understand the frustration but it took me over 1000 hours of Gold+ play from new release to max my manifest, and that includes so many games broken by the Vanguard glitch that you will never know about.
Why so serious dot gif - there is no risk of remote code execution.
Finally, there is a Friend's List. You don't have to play a public match ever. Go to Reddit or the nu-BSN and find some people that are willing to carry you, they exist. If you don't want to be carried, make your own friends.
Screaming at an extremely helpful non-employee here is a poor use of this website and you, the one who claims to be the offended party, just treated a good and helpful person like dirt.
I hope to see you on the field, don't accuse me of cheating when I sextuple your score.